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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2011 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: DateEncoder.html 740 2013-10-02 21:27:31Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.dellroad.stuff.string;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import java.text.ParseException;<a name="line.10"></a>
<span class="sourceLineNo">011</span>import java.text.SimpleDateFormat;<a name="line.11"></a>
<span class="sourceLineNo">012</span>import java.util.Date;<a name="line.12"></a>
<span class="sourceLineNo">013</span>import java.util.GregorianCalendar;<a name="line.13"></a>
<span class="sourceLineNo">014</span>import java.util.Locale;<a name="line.14"></a>
<span class="sourceLineNo">015</span>import java.util.TimeZone;<a name="line.15"></a>
<span class="sourceLineNo">016</span>import java.util.regex.Matcher;<a name="line.16"></a>
<span class="sourceLineNo">017</span>import java.util.regex.Pattern;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>/**<a name="line.19"></a>
<span class="sourceLineNo">020</span> * Encodes {@code Date} objects to and from strings.<a name="line.20"></a>
<span class="sourceLineNo">021</span> */<a name="line.21"></a>
<span class="sourceLineNo">022</span>public final class DateEncoder {<a name="line.22"></a>
<span class="sourceLineNo">023</span><a name="line.23"></a>
<span class="sourceLineNo">024</span>    /**<a name="line.24"></a>
<span class="sourceLineNo">025</span>     * Regular expression matching properly encoded strings.<a name="line.25"></a>
<span class="sourceLineNo">026</span>     */<a name="line.26"></a>
<span class="sourceLineNo">027</span>    public static final String PATTERN = "[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}(\\.[0-9]{3})?(Z)?";<a name="line.27"></a>
<span class="sourceLineNo">028</span><a name="line.28"></a>
<span class="sourceLineNo">029</span>    private static final String FORMAT_SECONDS = "yyyy-MM-dd'T'HH:mm:ss";<a name="line.29"></a>
<span class="sourceLineNo">030</span>    private static final String FORMAT_MILLIS = "yyyy-MM-dd'T'HH:mm:ss.SSS";<a name="line.30"></a>
<span class="sourceLineNo">031</span>    private static final String FORMAT_Z_SUFFIX = "'Z'";<a name="line.31"></a>
<span class="sourceLineNo">032</span><a name="line.32"></a>
<span class="sourceLineNo">033</span>    private DateEncoder() {<a name="line.33"></a>
<span class="sourceLineNo">034</span>    }<a name="line.34"></a>
<span class="sourceLineNo">035</span><a name="line.35"></a>
<span class="sourceLineNo">036</span>    /**<a name="line.36"></a>
<span class="sourceLineNo">037</span>     * Encode the given date as a string of the form {@code 2009-12-01T15:33:07.763Z}.<a name="line.37"></a>
<span class="sourceLineNo">038</span>     * If the fractional seconds portion is zero, it will be omitted.<a name="line.38"></a>
<span class="sourceLineNo">039</span>     *<a name="line.39"></a>
<span class="sourceLineNo">040</span>     * @param date date to encode<a name="line.40"></a>
<span class="sourceLineNo">041</span>     * @throws NullPointerException if {@code date} is {@code null}<a name="line.41"></a>
<span class="sourceLineNo">042</span>     */<a name="line.42"></a>
<span class="sourceLineNo">043</span>    public static String encode(Date date) {<a name="line.43"></a>
<span class="sourceLineNo">044</span>        String format = (date.getTime() % 1000 != 0 ? FORMAT_MILLIS : FORMAT_SECONDS) + FORMAT_Z_SUFFIX;<a name="line.44"></a>
<span class="sourceLineNo">045</span>        return DateEncoder.getDateFormat(format).format(date);<a name="line.45"></a>
<span class="sourceLineNo">046</span>    }<a name="line.46"></a>
<span class="sourceLineNo">047</span><a name="line.47"></a>
<span class="sourceLineNo">048</span>    /**<a name="line.48"></a>
<span class="sourceLineNo">049</span>     * Decode the given date.<a name="line.49"></a>
<span class="sourceLineNo">050</span>     *<a name="line.50"></a>
<span class="sourceLineNo">051</span>     * @param string encoded date<a name="line.51"></a>
<span class="sourceLineNo">052</span>     * @throws IllegalArgumentException if {@code string} is malformed<a name="line.52"></a>
<span class="sourceLineNo">053</span>     * @throws NullPointerException if {@code string} is {@code null}<a name="line.53"></a>
<span class="sourceLineNo">054</span>     */<a name="line.54"></a>
<span class="sourceLineNo">055</span>    public static Date decode(String string) {<a name="line.55"></a>
<span class="sourceLineNo">056</span>        Matcher matcher = Pattern.compile(PATTERN).matcher(string);<a name="line.56"></a>
<span class="sourceLineNo">057</span>        if (!matcher.matches())<a name="line.57"></a>
<span class="sourceLineNo">058</span>            throw new IllegalArgumentException("malformed date string");<a name="line.58"></a>
<span class="sourceLineNo">059</span>        String format = matcher.group(1) != null ? FORMAT_MILLIS : FORMAT_SECONDS;<a name="line.59"></a>
<span class="sourceLineNo">060</span>        if (matcher.group(2) != null)<a name="line.60"></a>
<span class="sourceLineNo">061</span>            format += FORMAT_Z_SUFFIX;<a name="line.61"></a>
<span class="sourceLineNo">062</span>        try {<a name="line.62"></a>
<span class="sourceLineNo">063</span>            return DateEncoder.getDateFormat(format).parse(matcher.group());<a name="line.63"></a>
<span class="sourceLineNo">064</span>        } catch (ParseException e) {<a name="line.64"></a>
<span class="sourceLineNo">065</span>            throw new RuntimeException("unexpected");<a name="line.65"></a>
<span class="sourceLineNo">066</span>        }<a name="line.66"></a>
<span class="sourceLineNo">067</span>    }<a name="line.67"></a>
<span class="sourceLineNo">068</span><a name="line.68"></a>
<span class="sourceLineNo">069</span>    /**<a name="line.69"></a>
<span class="sourceLineNo">070</span>     * Get a {@link SimpleDateFormat} configured with the given format and for the UTC time zone and strict parsing.<a name="line.70"></a>
<span class="sourceLineNo">071</span>     *<a name="line.71"></a>
<span class="sourceLineNo">072</span>     * @param format date format string<a name="line.72"></a>
<span class="sourceLineNo">073</span>     */<a name="line.73"></a>
<span class="sourceLineNo">074</span>    public static SimpleDateFormat getDateFormat(String format) {<a name="line.74"></a>
<span class="sourceLineNo">075</span>        final SimpleDateFormat dateFormat = new SimpleDateFormat(format);<a name="line.75"></a>
<span class="sourceLineNo">076</span>        dateFormat.setLenient(false);<a name="line.76"></a>
<span class="sourceLineNo">077</span>        dateFormat.setCalendar(new GregorianCalendar(TimeZone.getTimeZone("GMT"), Locale.US));<a name="line.77"></a>
<span class="sourceLineNo">078</span>        return dateFormat;<a name="line.78"></a>
<span class="sourceLineNo">079</span>    }<a name="line.79"></a>
<span class="sourceLineNo">080</span>}<a name="line.80"></a>
<span class="sourceLineNo">081</span><a name="line.81"></a>




























































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